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Optical properties of CVD grown amorphous Ge-Sb-S thin films
C.C.Huanga, C.C.Wub, K.Knighta, D.W.Hewaka
a. Optoelectronics Research Centre, University of Southampton, UK
b. Centre for Measurement Standards, Industrial Technology Research Institute, Hsinchu 30011, Taiwan, ROC
Germanium antimony sulphide (Ge-Sb-S) amorphous thin films have been fabricated on commercial glass substrates by chemical vapour deposition (CVD). The compositions and thicknesses of these thin films have been characterized by micro-Raman, scanning electron microscope (SEM) and energy dispersive X-ray analysis (EDX) techniques. Optical transmission spectra measured by UV-VIS-NIR spectrometer have been used to determine the optical properties of these CVD-grown Ge-Sb-S amorphous thin films with Swanepoel’s methods. Optical band gaps of these films were calculated from Tauc’s extrapolation procedure. The dispersions of the refractive indices of these films have also been determined using the Wemple-DiDomenico method.
Journal of Non-Crystalline Solids Jan (2010) Vol.356 pp.281-285
Copyright University of Southampton 2006